/**
 * jQuery JSON plugin 2.4.0
 *
 * @author Brantley Harris, 2009-2011
 * @author Timo Tijhof, 2011-2014
 * @source This plugin is heavily influenced by MochiKit's serializeJSON, which is
 *         copyrighted 2005 by Bob Ippolito.
 * @source Brantley Harris wrote this plugin. It is based somewhat on the JSON.org
 *         website's http://www.json.org/json2.js, which proclaims:
 *         "NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.", a sentiment that
 *         I uphold.
 * @license MIT License <http://opensource.org/licenses/MIT>
 */
(function ($) {
  'use strict';

  var escape = /["\\\x00-\x1f\x7f-\x9f]/g,
    meta = {
      '\b': '\\b',
      '\t': '\\t',
      '\n': '\\n',
      '\f': '\\f',
      '\r': '\\r',
      '"': '\\"',
      '\\': '\\\\'
    },
    hasOwn = Object.prototype.hasOwnProperty;

  /**
   * jQuery.toJSON
   * Converts the given argument into a JSON representation.
   *
   * @param o {Mixed} The json-serializable *thing* to be converted
   *
   * If an object has a toJSON prototype, that will be used to get the representation.
   * Non-integer/string keys are skipped in the object, as are keys that point to a
   * function.
   *
   */
  $.toJSON = typeof JSON === 'object' && JSON.stringify ? JSON.stringify : function (o) {
    if (o === null) {
      return 'null';
    }

    var pairs, k, name, val,
      type = $.type(o);

    if (type === 'undefined') {
      return undefined;
    }

    // Also covers instantiated Number and Boolean objects,
    // which are typeof 'object' but thanks to $.type, we
    // catch them here. I don't know whether it is right
    // or wrong that instantiated primitives are not
    // exported to JSON as an {"object":..}.
    // We choose this path because that's what the browsers did.
    if (type === 'number' || type === 'boolean') {
      return String(o);
    }
    if (type === 'string') {
      return $.quoteString(o);
    }
    if (typeof o.toJSON === 'function') {
      return $.toJSON(o.toJSON());
    }
    if (type === 'date') {
      var month = o.getUTCMonth() + 1,
        day = o.getUTCDate(),
        year = o.getUTCFullYear(),
        hours = o.getUTCHours(),
        minutes = o.getUTCMinutes(),
        seconds = o.getUTCSeconds(),
        milli = o.getUTCMilliseconds();

      if (month < 10) {
        month = '0' + month;
      }
      if (day < 10) {
        day = '0' + day;
      }
      if (hours < 10) {
        hours = '0' + hours;
      }
      if (minutes < 10) {
        minutes = '0' + minutes;
      }
      if (seconds < 10) {
        seconds = '0' + seconds;
      }
      if (milli < 100) {
        milli = '0' + milli;
      }
      if (milli < 10) {
        milli = '0' + milli;
      }
      return '"' + year + '-' + month + '-' + day + 'T' +
        hours + ':' + minutes + ':' + seconds +
        '.' + milli + 'Z"';
    }

    pairs = [];

    if ($.isArray(o)) {
      for (k = 0; k < o.length; k++) {
        pairs.push($.toJSON(o[k]) || 'null');
      }
      return '[' + pairs.join(',') + ']';
    }

    // Any other object (plain object, RegExp, ..)
    // Need to do typeof instead of $.type, because we also
    // want to catch non-plain objects.
    if (typeof o === 'object') {
      for (k in o) {
        // Only include own properties,
        // Filter out inherited prototypes
        if (hasOwn.call(o, k)) {
          // Keys must be numerical or string. Skip others
          type = typeof k;
          if (type === 'number') {
            name = '"' + k + '"';
          } else if (type === 'string') {
            name = $.quoteString(k);
          } else {
            continue;
          }
          type = typeof o[k];

          // Invalid values like these return undefined
          // from toJSON, however those object members
          // shouldn't be included in the JSON string at all.
          if (type !== 'function' && type !== 'undefined') {
            val = $.toJSON(o[k]);
            pairs.push(name + ':' + val);
          }
        }
      }
      return '{' + pairs.join(',') + '}';
    }
  };

  /**
   * jQuery.evalJSON
   * Evaluates a given json string.
   *
   * @param str {String}
   */
  $.evalJSON = typeof JSON === 'object' && JSON.parse ? JSON.parse : function (str) {
    /*jshint evil: true */
    return eval('(' + str + ')');
  };

  /**
   * jQuery.secureEvalJSON
   * Evals JSON in a way that is *more* secure.
   *
   * @param str {String}
   */
  $.secureEvalJSON = typeof JSON === 'object' && JSON.parse ? JSON.parse : function (str) {
    var filtered =
      str
      .replace(/\\["\\\/bfnrtu]/g, '@')
      .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
      .replace(/(?:^|:|,)(?:\s*\[)+/g, '');

    if (/^[\],:{}\s]*$/.test(filtered)) {
      /*jshint evil: true */
      return eval('(' + str + ')');
    }
    throw new SyntaxError('Error parsing JSON, source is not valid.');
  };

  /**
   * jQuery.quoteString
   * Returns a string-repr of a string, escaping quotes intelligently.
   * Mostly a support function for toJSON.
   * Examples:
   * >>> jQuery.quoteString('apple')
   * "apple"
   *
   * >>> jQuery.quoteString('"Where are we going?", she asked.')
   * "\"Where are we going?\", she asked."
   */
  $.quoteString = function (str) {
    if (str.match(escape)) {
      return '"' + str.replace(escape, function (a) {
        var c = meta[a];
        if (typeof c === 'string') {
          return c;
        }
        c = a.charCodeAt();
        return '\\u00' + Math.floor(c / 16).toString(16) + (c % 16).toString(16);
      }) + '"';
    }
    return '"' + str + '"';
  };

}(jQuery));
